My two favorite circuits

252

02:44:13

Both of the circuit's are very simple, making some of the building blocks for today's ic intended layout, be child like think simple. Avoid childishness it gets in your way; thinking you can't do that - that way. 
In the late 1970's when the  RISC processor was produced, they never thought it would be available for a few dollars and be used for home automation. Now we call them arduino boards and use them for everything.
Simple is good.

published 10 years ago

ferlop

10 years ago

yra, I am with you on simple is better... I have a nagging question, on your timer ic, what is the actual fo, because it changes when you change the time setting........................................... ....................................... It's behaving like the self clocking counters that we started using. Thanks

yra

10 years ago

As i understand this is a infinite clock timer only restricted by the silicon it's made from. Meaning in the real world wire size soldier and manufacturing are the limitations to your question.

yra

10 years ago

The dopeing of the layer is what sets a capacity, resistance or induction of electron flow so mfg sets the limitation of frequencies.. ec is ideal world conditions..

ferlop

10 years ago

I board tested the timer and I was surprised that it actually oscillates at 1666.66.....HZ

yra

10 years ago

Very cool, real world result.

hurz

10 years ago

@ferlop, 1666kHz ? Its close to my first guess ;p http://everycircuit.com/circuit/4522192772530176

ferlop

10 years ago

@Hurz,you are right again, I misread my oscope, been a while since I used this old beast. ...............so it's all in the internal capacitance of the transistors and diodes inside the 555, correct?

ferlop

10 years ago

@hurz, what are the chances that the nikisalli counter oscillator will work in real? ......................................I don't have any chips to run a test how about someone else doing a test on it?

hurz

10 years ago

Yes, the internal resistance of output driver transistor and input capacitance and internal delay does set the maximum operating frequency. One might use this as test circuit for speed selection to compare different suppliers. Nikis osci - the one with counter and inverter - i am afraid it wont work in reality.

ferlop

10 years ago

@hurz, if the 555 is limited to 200KHZ then why is it self clocking at 1.66 MHZ without any problem?

ferlop

10 years ago

Also if you connect an LED to the out put, you will encounter the convergence problem! :)

hurz

10 years ago

From were do you have 200kHz as limit. I remember something about 2000kHz

ferlop

10 years ago

Oh, OK, My mistake, I thought I read it somewhere.

add comment in editor

EveryCircuit is an easy to use, highly interactive circuit simulator and schematic capture tool. Real-time circuit simulation, interactivity, and dynamic visualization make it a must have application for professionals and academia. EveryCircuit user community has collaboratively created the largest searchable library of circuit designs. EveryCircuit app runs online in popular browsers and on mobile phones and tablets, enabling you to capture design ideas and learn electronics on the go.